Measuring blood pressure
Blood pressure is indicated by two numbers.
○ The first is the systole, when the heart contracts and ejects blood into the arteries.
○ The second is the diastole, when the heart relaxes. The reading is a unit of pressure expressed as millimeters of mercury (mmHg).
It is generally written as "120/80 mm Hg."
Blood pressure throughout your day
Blood pressure has a daily pattern. During the day, your blood pressure continues to rise. It usually experiences a peak in the middle of the afternoon. In the evening, BP begins to decrease. Normally, it should be lower at night, when you are asleep.
"Blood pressure can be highly variable. Thus the diagnosis of hypertension should not be based on a single set of blood pressure readings at a single office visit, unless the blood pressure is substantially increased."
European Society of Cardiology: Guidelines for the management of arterial hypertension (ESC-ESH Guidelines 2018)
What is a normal blood pressure for an adult?
According to the European Society of Cardiology, systolic pressure of less than 120 and diastolic pressure of less than 80 is a normal, healthy blood pressure.
Hypertension, or high blood pressure, is above 140/90 mm Hg for an adult.